Bad taste in mouth after skin graft

[nunz7777]

I had a receeding gum and had a skin graft over 3 years ago.  Nine months after this graft was done I started experiencing a spongy gooey feeling and a funny taste coming from that area.  It got so bad the spongy feeling and taste I had my orthodonist remove the old graft and do a new one.  No relief.  I finally had my tooth pulled about a year ago to see if that would help.  It is now worse.  The taste is worse than ever and it is a sour, bitter like taste. I have worn a retainer to keep my tongue away from the spongy area. This helps especially if the taste isn't bad.  I've been to several doctors including ENT's and no one seems to know what it is.  Dry mouth is what they suspected, but I do not have many symptons of that.  It is the spongy feeling and terrible taste that drives me crazy.  My family doctor thinks I may have nerve damage from rubbing my tongue on original skin graft.  He feels that's why I had no problems for the first 9 months afterwards.  If that is the case, the second skin graft and pulling of the tooth certainly didn't help any.  I take vitamins including vitamin B-12, hoping that might help my nerves.  Anyone have any ideas or help?  Thank you.